Pump



April 3, 19:28. v 66u64 A. s. WELDY AFiled sept. s. 192s ATTORNEY `of Fig. 2;

Patented Apr. 3, 1928.

' UNITED STATES .ARTHUR SHELDON WELDY,OF CANTON, OHIO.

PUMP.

Application led September 3, 1926; Serial No. 133,452.

`My invention relates to pumps4 and particularly to rotating pumps in which the dischargev therefrom [may be accurately measured and regulated. y

The objects of my invention are to providea pump of this general character which may operate `at comparatively high speed without noise 0r vibration; which is easily adjusted to compensate for the wear of certain elements therein; and which may bel regulated to accurately discharge at any predetermined rate between zero and its maximum capacity. Another object of my invention is to provide a pump in which the action may be readily reversed without changing the direction of the drive, or which may be adjusted to operate in the same way regardless of the direction in which it is driven.

With these objects in view my invention includes the lnovel elements and combinations of elements described below and illustrated lin the accompanying drawing in which- Fig. 1 is a view of my pump in partial section along a plane containing the 'axis of rotation. It` is a section in the plane 1-1 Fig. 2 is a section of Fig. l in the broken planes -2--2;

Fig. f3 is an outside elevation of the cover plate for my pump on the side opposite the driving shaft;

Fig. 4 is a perspective view of the rotor or driving member;

Figs. 5 and 6 are views of the rotor and piston at oppositely disposed ends of the piston stroke; and

Fig. 7 is a modified form of piston.

Referring tothe drawings, my pump comprises a housing formed of the annular ring, 1, andthe cover plates, 2 and 3. The cover late 2 is secured to rino 1, b ca) screws i3 a 7 by a 4, and the cover plate, 3, which may hereinafter be referred to as the differential plate, is secured to ring, 1, by cap screws, 5. llhe cover plate, l2,`is provided with a bearing', 6, adapted to receive the driving shaft, 7, which ordinarily would be connected to an electric motor. The exterior end of this bearing is threaded, as shown at 4.0, to receive a nut (not shown) adapted to compress a packing about shaft, 7. The axis of shaft, 7 is substantially coincident with the axis of ring, 1. a

The inner side of plate,'3, is provided with a centrally disposed stub shaft, 8, adapted to carry the rotating, reciprocatingpiston or driven element, 9. The axis of this stub shaft, 8, when the device is assembled as shown in the drawings, lies in the same horizontal plane as,` the axis of shaft, 7, but is eccentric thereto in a horizontal direction, by the distance, 10, indicated in Fig. 2. In practice, I prefer to make this maximum eccentricity about ,1g of an inch, or,`in other words, to provide a pump having a maximum stroke of about 1/5v` of an be explainedV later.

Preferably integral with shaft, 7, is the rotor or driving element, 11, cylindricalin shape, and recessed, as shown at 12, in Figs. 1 and 2, to receive the driven element, 9. A cover plate, 13,`of the same diameter as the rotor, 11, is secured to the face of the rotor by means of screws, 1a. This plate is provided with a circular opening, 15,'in the center, and the inner facethereof is ground to a sliding fit with piston, 9. Thefperiphery of the rotor, for a shortdis'tance in from the plate, 13, is slightly smaller in diameter inch, asy will than the plate or other portion of therotor,

so that when the plate is secured in place, there is an annular recess, V16, formedV between the plate and the rotor.4 yResting upon the top halfof the rotor is the cutoff gland,

17, preferably of brass. This gland is prvided with the inwardly projecting ribs or lips, 18, which are adapted to a running fit in the recess, 1G, between the rotor and cover plates, as shown in Fig. 1. The centrai inner part of the gland, f17, isprovided with a recess, 19, Vwhich extends cirdiimferentially about the inner part of the gland, but which terminates at its extremities -where inwardly extending projections, 2O

and therecess, 19, is closed at `each end by contact of thel projections, 20 and 21, with the bottom, 22, of the recess, I16. At the end of the gland, 17, which is shown at the right in Fig. 2 and which `is angular-ly located about the rotor, 11, so that it'will be substantially at the end Aof the pumping stroke ofthe piston, 9, is discharge'pipe, 23, communicating with recess," 19,thro'n h "the threaded hole, 24, and `the deeper" portion,'25,

of recess, 19. The pipe, 23,is bent in a semicircleso as to` clear rotor, 11, and the end,

"26, thereof is threaded into the discharge opening, 27, in the ring, 1. The gland, 17, is

e held inn contact with rotor, 11, by meansV of the adjusting screws, 28, 29 and 30, which are threaded through ring, 'f 1, and are l screwed down in contact with'the outer pe- I ingnstub shaft,8` may bemoved toward or Y `from ythe axis ofthe shaft, 7, thereby varyriphery of Vthe gland. These adjustingk screwsy 'are' covered andprotected by the plugs, 39, To `prevent the glandfrom rotating, the point of screw, 29, may be carried Vdown `into the gland, as shown .at131.

The holes, V32 (see Fig. 3), in the diiferen- 4tial plate,'3,andthrough which` pass the cap screws, 5, are slotted in a horizontal direction so that the differentialplate, 3, carryinglthegeccentricity of the shafts. I

Y, The driven member, 9, is provided, as

' shown in Fig. 2, with a pistonor radially projecting member, 33. rlhis portionV of the member, 9, does the actual pumping of the `liquidlandfis accurately ground on the curvi-V linear surfaces, 311 and 35,to't-angentially 'fit the sides, V36 and 37, of a slot, 38, in rotor,

".11.l This slot ertendsfrom the recess, 12,

inv the rotorrtothe cylindrical surface, 22,

Aforming the bottom of recess, 16. .l Y

In operatmg'my device, oil, or,` other liquid Ato bepumped, is introduced into the `interior of the housing through the openpivling, 36, in ring, ,1.,Y

rlChis oil fills the `interior of the housing. As. the rotor turns in thedirectionof Athearrow shownin Figs.

2, 5r and 6, the piston, 33, of driven member,

9, willbe` reciprocated in the`recess, 38, be-

cause l,the rotor will be turning about the axis ofshaft,7, as a center and the Vdriven member will be` rotating about the axis of i stub shaft, 8, as acenter.' These axes are not coincident, and because of this eccen- V A tricity, the piston,` 33, will'move, outwardly Vpiston will beat the endofits discharging movement when the rotor is in the position shown in Fig. 6. Y As'the rotormoves in the directionof the arrows from the position shown in `F ig. 6` to the position shown in Fig. 5, the 'piston will be retracted in the recess,`38,

f andthis recess, beyond the outer end of the Vpiston, will become filled with the liquid from the casing. As the rotor moves in the direction of the .arrowsV from theposition shown inFig. 5 to the position shownin Fig. 6the piston Vwill move outwardly forcing the small quantity of liquid in recess, 38,

into the recess, 19, in gland, 17. .The oil once delivered into gland, 17, cannot return to the casing becausethel gland is in close contact withthe rotor surface and the surface of the tweenthe; axes of shafts, V7 and 8, may be varied, producing a corresponding variation in the stroke' of the piston and the discharge of thepump. When the axes, are coincident there will be no relative movement ofthe piston and rotor, and when (referring to Fig. 2) the axisof shaft, 8, is moved to the left of the' anis of shaft, 7, the action of the pump will be reversed unless the direction of rotationis changed. L Y f In fabricating my device, the casing may be ofcast iron, brass orthe like, but to rhinimizewear, the piston shoul'dbe of hardened tool steel closelyhtting the receSs,38, de-

fined bythe rotor, the surfaces, V36 and 37, i

and the cover plate, 13. From considerationof the foregoing, 1t

will beapparentthat the action. of my` pump may be reversed without-reversing thedirection of rotation. `If desired, the cover plate,

3, vmay be'shifted so that'theaxis ofstubshaft,.8, will lie to the left ofvdriving shaft, 7, instead fof to the right, as shown inFig.

ifi.)

2.l In thiscase the pump will withdraw a 1 liquid from recess, 19, in gland, 177,'and1discharge it into the'casing, and liquid supplied through pipe, 23, will beforced ,out opening, v

A36. Inlilre manner,.should it appeardesirable, theV direction yof rotation may be reversed without reversing the operation.y

Where light, thin liquids, are to be pumped, or, in other cases if desired, a two piece driven member ofthe general `form shown in Fig. 7 maybe substituted forthe piston, 9. In this case, the block, A41, which vforms the piston v proper, is yaccurately ground to fit the cylinderv or chamber formed between the cover plate, 13,the` rotor, `11, and the surfaces, 36 and 37. This block is `bored to receive the cylindrical end, Li2, of the member, 43,'which acts as a wrist pin in 4bloclrgill. `To provide for the slight oscillating movemeiitof the block` on the wrist pin, the sides of the opening from the bottom of the block (when in the position shown in Fig. 7 )Hare slightly beveled, as shown vat 44. i i

Y, VVhile'I have described the detailsof my device in its preferred forms, it is to be understood that the words which I: have used are y vwords of Y description rather than words :of limitation, and that changes, within the lpurview of they appended claims, may be made withoutdeparting from the truescope `and spirit ofzmy invention in its ybroadest aspects. Y p

`WhatI claim is-' 1 Y. l. A pump comprising ,a casing, closely lam llo

interfitting members rotatively mounted independent of and eccentric to each other within said casing and forming a pumping unit comprising a cylinder and plunger adapted to reciprocate therein, means for varying the relative reciprocating movement of said members, and means separate from said casing in contact with one of said members adapted to receive the discharge of said unit.

2. A pump comprising a casing, closely interfitting members rotatively mounted independent ol and eccentric to each other within said casing and forming a pumping unit comprising a cylinder and plunger adapted to reciprocate therein, means in contact with one of said members adapted to receive the discharge of said unit, and means for adjusting the contact pressure between said member and said receiving means.

3. A pump comprising a casing, closely interfitting members rotatively mounted independent of and eccentric to each other within said casing and forming a pumping unit comprising a cylinder and plunger adapted to reciprocate therein, means for varying the relative reciprocating move-y ment of said members, means in contact with one of said members adapted to receive the discharge of said unit, and means for adjusting the contact pressure between said lmember and the receiving means.

4. A pump comprising a casing, a cylindrical driving member mounted to rotate therein, a driven member rotatively mounted eccentric to and adapted to reciprocate radially within the driving member, a gland memberclosely fitting the periphery of the driven member, and means 'for adjusting the Contact pressure between the driving member and the gland.

5. A pump comprising a casing, a cylindrical driving member mounted to rotate therein, a driven member rotatively mounted eccentric to and adapted to reciprocate radially within the driving member, a gland element closely fitting the periphery of the driven member, means for adjusting the contact pressure between the driving member and the gland, and means for varying the ecentricity of the driving and driven memers.

6. In a pump of the character described, the combination with a casing, of closely intertting members rotatively mounted independent of and eccentric to each other within said casing and forming a pumping unit comprising a cylinder and plunger adapted to discharge outwardly from the axis of rotation, and a gland element separate from said casing in Contact with'one of said members adapted to receive the discharge of said unit.

7. In a pump of the character described, the combination with a casing, of a cylindrical driving member mounted to rotate therein, a driven member eccentrically mounted to reciprocate radially within the driving member, and a gland element separate Jfrom said casing closely fitting the periphery of the driving member within the zone of outward radial movement of the driven member toetect a cut oii between the source of liquid supply and the discharge receiver.

8. ln a pump of the character described, the combination with a casing, of a driving member axially mounted therein, a driven member axially mounted independent of but yhaving a radial portion closely interiitting and forming a plunger adapted to reciprocate within said last mentioned member, and a slidable cover plate for said casing carrying the axial mounting for the rdriven member and adapted to be moved relative to said casing to vary the relative movement of said members.

9. In a pump of the character described, relatively reciprocating elements rotatively mounted independent of and eccentric to each other, and closely interfitting along opposed, substantially tagnential surfaces parallel to the axes of rotation; whereby said elements may oscillate slightly in respect to each other during the reciprocating movement.

l0. In a pump comprising a rotor provided with a rectangular passage therein, a plunger element closely fitted and adapted to reciprocate in said passage andhaving curved surfaces tangential to opposite sides of said passage whereby said plunger may oscillate relative to said rotor during the reciprocating movement.

11. In a pump of the character described, relatively reciprocating elements rotatively mounted independent of and eccentric to each other, and closely interfitting along substantially tangential surfaces ;V whereby said elements may oscillate in respect to each other during the reciprocating movement.

12. In a pump of the character described, the combination with a casing, of a rotating element therein formingthecylinder of said pump, a piston element adapted to be positively reciprocated in said cylinder, and a gland element separate from said casing and in contact with the cylinder forming element adapted to eiect a cut 01T between the intake and discharge strokes of said pump.

ARTHUR SHELDON WELDY. 

